This is a "spring-mass" mass problem.
g=32.2 ft/sec² (accel. due to gravity)
Let y=displacement (downwards) in the same direction as g, then the differential equation that governs the motion is:
acceleration = -ky, or
y"+ky=0 where y"=d²y/dt²
The solution of the auxiliary equation is
(m^2+k)=0, or m=±i√k
and the solution to the equation is
y=C1 cos(√k t) + C2 sin(√k t)
The initial conditions are:
y(0)=-0.5=C1 cos(0) + C2 sin(0)
C2=0, and C1=-0.5
y'(t)=-C2√k sin(√k t) + C2 √k cos(√k t)
y'(0)=0=-C2√k sin(0) + C2 √k cos(0)
C2=0 since sin(0)=0, √k≠0 and cos(0)≠0.
So the equation of motion is:
Answers to (b) and (c) can be deduced from the equation of motion.
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